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https://issues.apache.org/jira/browse/KAFKA-3394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194032#comment-15194032
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Ismael Juma commented on KAFKA-3394:
------------------------------------
This is a regression caused by changing `KafkaApis` to use the Java protocol
classes. Marking as a blocker since it breaks existing clients.
> Broker fails to parse Null Metadata in OffsetCommit requests
> ------------------------------------------------------------
>
> Key: KAFKA-3394
> URL: https://issues.apache.org/jira/browse/KAFKA-3394
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.10.0.0
> Reporter: Magnus Edenhill
> Priority: Blocker
> Fix For: 0.10.0.0
>
>
> librdkafka sends a Null Metadata string (size -1) in its OffsetCommitRequests
> when there is no metadata, this unfortunately leads to an exception on the
> broker that expects a non-null string.
> {noformat}
> [2016-03-11 11:11:57,623] ERROR Closing socket for
> 10.191.0.33:9092-10.191.0.33:56503 because of error (kafka.network.Processor)
> kafka.network.InvalidRequestException: Error getting request for apiKey: 8
> and apiVersion: 1
> at
> kafka.network.RequestChannel$Request.liftedTree2$1(RequestChannel.scala:91)
> at kafka.network.RequestChannel$Request.<init>(RequestChannel.scala:88)
> at kafka.network.Processor$$anonfun$run$11.apply(SocketServer.scala:426)
> at kafka.network.Processor$$anonfun$run$11.apply(SocketServer.scala:421)
> at scala.collection.Iterator$class.foreach(Iterator.scala:727)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
> at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
> at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
> at kafka.network.Processor.run(SocketServer.scala:421)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.kafka.common.protocol.types.SchemaException: Error
> reading field 'topics': Error reading field 'partitions': Error reading field
> 'metadata': java.lang.NegativeArraySizeException
> at org.apache.kafka.common.protocol.types.Schema.read(Schema.java:73)
> at
> org.apache.kafka.common.requests.OffsetCommitRequest.parse(OffsetCommitRequest.java:260)
> at
> org.apache.kafka.common.requests.AbstractRequest.getRequest(AbstractRequest.java:50)
> at
> kafka.network.RequestChannel$Request.liftedTree2$1(RequestChannel.scala:88)
> ... 9 more
> {noformat}
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